Bilstein B12 Pro-Kit Suspension Kit 46-181237 for BMW Z4 E85 Roadster (20022009) 2.2i 2.5i 2.5si 3.0i 3.0si B8 Dampers + Eibach Pro-Kit Springs, 1030mm Lowering

Sports Shock and Spring Package for BMW Z4 E85 Roadster 2002 to 2009 - Part No. 46-181237

Give your BMW Z4 E85 the fast-road composure it deserves with this matched damper and spring package from Bilstein and Eibach. Built around Bilstein B8 shortened monotube shock absorbers working with Eibach progressive-rate coils, this set delivers sharper turn-in, flatter cornering and a tasteful ride-height drop of around 10 to 30 mm depending on engine and specification. It is the ideal fixed-height alternative to adjustable coilovers for drivers who want OEM-level reliability with a serious uplift in control and confidence.

We have installed and run this setup ourselves on Z4s, and customer feedback on comfort, grip and stability has been outstanding. Daily usability remains intact on British roads while body control is vastly improved during spirited driving.

Key advantages

• Purpose-built handling upgrade for the BMW Z4 E85 Roadster models 2.2i, 2.5i, 2.5si, 3.0i and 3.0si
• Bilstein B8 gas-pressure monotube dampers paired with Eibach progressive springs for a perfectly balanced setup
• Approximate drop of 10 to 30 mm for a purposeful stance without compromising ground clearance
• Quicker steering response, reduced pitch and roll, improved mid-corner stability and enhanced traction
• Consistent damping performance thanks to Bilstein’s gas-pressure technology and precision valving
• Engineered in Germany and TÜV approved for quality and peace of mind

What is included

• 4 x Bilstein B8 performance shock absorbers
• 4 x Eibach progressive-rate springs
• Vehicle-specific kit tailored to the BMW Z4 E85 chassis

Fitment information

BMW Z4 Roadster E85 09.2002 to 12.2009:

• 2.2i
• 2.5i
• 2.5si
• 3.0i
• 3.0si

How it feels on the road

Expect a planted front end with confident turn-in, strong high-speed stability and excellent body control over undulations. Ride comfort remains civil for commuting and long journeys, while the car takes on B-roads with precision and composure. It is a genuine step beyond stock without the fuss of adjusters or constant tweaking.

Compatibility check

We verify compatibility before dispatch. Add your UK registration or the last 7 of your VIN at checkout and we will confirm fitment for your BMW Z4 E85.

Professional fitting

Want it fitted correctly the first time We recommend installation at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote.

Part details

Part number: 46-181237 | BILSTEIN-46-181237

Shock type: Gas pressure monotube

EAN: 4025258674625

UPC: 651860673028

Why buy from us

We supply and fit these kits regularly and our customers love the transformation. This is a proven upgrade that blends comfort with genuine performance, perfect for road use and weekend blasts.

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In summary

This Bilstein and Eibach matched package for the BMW Z4 E85 transforms the way your roadster drives, looks and feels. Enjoy precision, control and everyday comfort with a tasteful drop and quality components that last. Order with confidence using part number 46-181237.